Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2bd8ca8494e57d…

MALICIOUS

PDF

61.9 KB Created: 2020-11-22 20:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 656bda4477d2797d571e0d77f043b7d7 SHA-1: 17da2e63094cd840570a5c3b81ca5eb1bf926e56 SHA-256: 3c2bd8ca8494e57d3fc61dd40ff7378a2c6cccd25bee32da2fcc7234c3a06f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', strongly suggests an attempt to direct users to potentially harmful websites. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/123?utm_term=dreadful+wind+and+rain+chords
    • https://cdn-cms.f-static.net/uploads/4417806/normal_5fb68054612b1.pdf
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/gagimiguvekolov.pdf
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5fb540d4a9cd0.pdf
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5f8e9cb842576.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f92dcf2e0b36.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/nibakemiwa.pdf
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f99129f2109c.pdf
    • https://zobejonimofov.weebly.com/uploads/1/3/4/3/134354570/xopun.pdf
    • https://cdn-cms.f-static.net/uploads/4469136/normal_5fba00439816d.pdf
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f9103667f768.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zokokamu/88281519926.pdf
    • https://s3.amazonaws.com/dusubonifu/little_johnny_jokes_for_adults.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b687.bin
37e8a0d861b0591c7ff858ede1cf04a197f0553c6e06a7fbc06b3fe24c12ee8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB687 5200 bytes
font_01_sfnt_off0000c849.bin
1cceb751190c1e55b14c78fb1480aec7aa256383e2a7aa43db2e54b32937d1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 10232 bytes

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